Summary cis-3,4-Dichlorocyclobutene reacts with 3,6-di-(2-pyridyl)-s-tetrazine in refluxing chlorobenzene to yield a new bridgehead nitrogen ring system, the 8a-azonia-3,4-diazaphenanthrene cation, the structure of which was confirmed by X-ray analysis.
J. A. Elix, M. Sterns, W. S. Wilson and R. N. Warrener, J. Chem. Soc. D, 1971, 426b DOI: 10.1039/C2971000426B
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